The Repentance Tower is a very rare example of a mid-16th century watch tower standing on Trailtrow Hill. Built in 1565 by John Maxwell, the tower takes its name from an inscription Repentance carved on the stonework above the entrance door.
The watch tower remained with the Maxwells until in around 1627 the sixth Lord Herries sold Hoddam Castle and the tower to Sir Richard Murray of Cockpool (Comlongan) Castle. The barony and castle were purchased in 1690 by John Sharpe and remained with that family until 1878.
The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.